import math
def WebMercator2lonLat(x,y):
    lon = x/20037508.34*180;
    lat = y/20037508.34*180;
    lat= 180/math.pi*(2*math.atan(math.exp(lat*math.pi/180))-math.pi/2);
    return lon,lat

print(WebMercator2lonLat(13150056.08
,2805342.495
))